Microsoft has reversed its decision to pull the plug on MSN Music’s authorization servers, according to an e-mail sent out to customers this afternoon. Customers who bought music from the now-defunct service will now be able to continue listening to their music and transferring it to new machines until at least the end of 2011. At that time, Microsoft says that it will evaluate how often the servers are being used and will determine what (if any) further steps to take to support customers.

Since MSN Music was never a world beater, it’s hard to believe that keeping the servers going is putting a huge hole in Microsoft’s pocket so the reprieve is a good business move from a public relations perspective. Unfortunately, doing the right thing two months after the original PR hit is significantly less desirable than doing it right the first time.